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The original was posted on /r/osr by /u/thropwurst on 2024-04-09 06:10:27.

Can someone explain the pros and cons of a d20 system that uses a static number for defense (d20+str modifier vs AC) vs a system where both the attacker and defender roll? (d20+strength modifier vs d20+ dex modifier) Knave vs Durf for example. Or is it really no difference? Just a Preference?